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Windows 7 and beyond pre-release builds.

Since this is not about the final versions of the following OS's (Win 7, Win 8, Win 8.1, and Win 10) I'm pretty sure this won't get taken down
Anyways
I was wondering whether or not the possibility of adding the development builds on win 7, win 8, and win 10 is a thing. I am wanting to view these builds and document them at some point and have been unable to find most of them.
Of course, I am not asking about the final builds, but the dev builds.